1 /* 2 * Elan Microelectronics touch panels with I2C interface 3 * 4 * Copyright (C) 2014 Elan Microelectronics Corporation. 5 * Scott Liu <scott.liu@emc.com.tw> 6 * 7 * This code is partly based on hid-multitouch.c: 8 * 9 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> 10 * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 11 * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France 12 * 13 * 14 * This code is partly based on i2c-hid.c: 15 * 16 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 17 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France 18 * Copyright (c) 2012 Red Hat, Inc 19 */ 20 21 /* 22 * This software is licensed under the terms of the GNU General Public 23 * License version 2, as published by the Free Software Foundation, and 24 * may be copied, distributed, and modified under those terms. 25 */ 26 27 #include <linux/module.h> 28 #include <linux/input.h> 29 #include <linux/interrupt.h> 30 #include <linux/irq.h> 31 #include <linux/platform_device.h> 32 #include <linux/async.h> 33 #include <linux/i2c.h> 34 #include <linux/delay.h> 35 #include <linux/uaccess.h> 36 #include <linux/buffer_head.h> 37 #include <linux/slab.h> 38 #include <linux/firmware.h> 39 #include <linux/input/mt.h> 40 #include <linux/acpi.h> 41 #include <linux/of.h> 42 #include <linux/gpio/consumer.h> 43 #include <linux/regulator/consumer.h> 44 #include <asm/unaligned.h> 45 46 /* Device, Driver information */ 47 #define DEVICE_NAME "elants_i2c" 48 49 /* Convert from rows or columns into resolution */ 50 #define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) 51 52 /* FW header data */ 53 #define HEADER_SIZE 4 54 #define FW_HDR_TYPE 0 55 #define FW_HDR_COUNT 1 56 #define FW_HDR_LENGTH 2 57 58 /* Buffer mode Queue Header information */ 59 #define QUEUE_HEADER_SINGLE 0x62 60 #define QUEUE_HEADER_NORMAL 0X63 61 #define QUEUE_HEADER_WAIT 0x64 62 63 /* Command header definition */ 64 #define CMD_HEADER_WRITE 0x54 65 #define CMD_HEADER_READ 0x53 66 #define CMD_HEADER_6B_READ 0x5B 67 #define CMD_HEADER_RESP 0x52 68 #define CMD_HEADER_6B_RESP 0x9B 69 #define CMD_HEADER_HELLO 0x55 70 #define CMD_HEADER_REK 0x66 71 72 /* FW position data */ 73 #define PACKET_SIZE 55 74 #define MAX_CONTACT_NUM 10 75 #define FW_POS_HEADER 0 76 #define FW_POS_STATE 1 77 #define FW_POS_TOTAL 2 78 #define FW_POS_XY 3 79 #define FW_POS_CHECKSUM 34 80 #define FW_POS_WIDTH 35 81 #define FW_POS_PRESSURE 45 82 83 #define HEADER_REPORT_10_FINGER 0x62 84 85 /* Header (4 bytes) plus 3 fill 10-finger packets */ 86 #define MAX_PACKET_SIZE 169 87 88 #define BOOT_TIME_DELAY_MS 50 89 90 /* FW read command, 0x53 0x?? 0x0, 0x01 */ 91 #define E_ELAN_INFO_FW_VER 0x00 92 #define E_ELAN_INFO_BC_VER 0x10 93 #define E_ELAN_INFO_TEST_VER 0xE0 94 #define E_ELAN_INFO_FW_ID 0xF0 95 #define E_INFO_OSR 0xD6 96 #define E_INFO_PHY_SCAN 0xD7 97 #define E_INFO_PHY_DRIVER 0xD8 98 99 #define MAX_RETRIES 3 100 #define MAX_FW_UPDATE_RETRIES 30 101 102 #define ELAN_FW_PAGESIZE 132 103 104 /* calibration timeout definition */ 105 #define ELAN_CALI_TIMEOUT_MSEC 12000 106 107 #define ELAN_POWERON_DELAY_USEC 500 108 #define ELAN_RESET_DELAY_MSEC 20 109 110 enum elants_state { 111 ELAN_STATE_NORMAL, 112 ELAN_WAIT_QUEUE_HEADER, 113 ELAN_WAIT_RECALIBRATION, 114 }; 115 116 enum elants_iap_mode { 117 ELAN_IAP_OPERATIONAL, 118 ELAN_IAP_RECOVERY, 119 }; 120 121 /* struct elants_data - represents state of Elan touchscreen device */ 122 struct elants_data { 123 struct i2c_client *client; 124 struct input_dev *input; 125 126 struct regulator *vcc33; 127 struct regulator *vccio; 128 struct gpio_desc *reset_gpio; 129 130 u16 fw_version; 131 u8 test_version; 132 u8 solution_version; 133 u8 bc_version; 134 u8 iap_version; 135 u16 hw_version; 136 unsigned int x_res; /* resolution in units/mm */ 137 unsigned int y_res; 138 unsigned int x_max; 139 unsigned int y_max; 140 141 enum elants_state state; 142 enum elants_iap_mode iap_mode; 143 144 /* Guards against concurrent access to the device via sysfs */ 145 struct mutex sysfs_mutex; 146 147 u8 cmd_resp[HEADER_SIZE]; 148 struct completion cmd_done; 149 150 u8 buf[MAX_PACKET_SIZE]; 151 152 bool wake_irq_enabled; 153 bool keep_power_in_suspend; 154 }; 155 156 static int elants_i2c_send(struct i2c_client *client, 157 const void *data, size_t size) 158 { 159 int ret; 160 161 ret = i2c_master_send(client, data, size); 162 if (ret == size) 163 return 0; 164 165 if (ret >= 0) 166 ret = -EIO; 167 168 dev_err(&client->dev, "%s failed (%*ph): %d\n", 169 __func__, (int)size, data, ret); 170 171 return ret; 172 } 173 174 static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) 175 { 176 int ret; 177 178 ret = i2c_master_recv(client, data, size); 179 if (ret == size) 180 return 0; 181 182 if (ret >= 0) 183 ret = -EIO; 184 185 dev_err(&client->dev, "%s failed: %d\n", __func__, ret); 186 187 return ret; 188 } 189 190 static int elants_i2c_execute_command(struct i2c_client *client, 191 const u8 *cmd, size_t cmd_size, 192 u8 *resp, size_t resp_size) 193 { 194 struct i2c_msg msgs[2]; 195 int ret; 196 u8 expected_response; 197 198 switch (cmd[0]) { 199 case CMD_HEADER_READ: 200 expected_response = CMD_HEADER_RESP; 201 break; 202 203 case CMD_HEADER_6B_READ: 204 expected_response = CMD_HEADER_6B_RESP; 205 break; 206 207 default: 208 dev_err(&client->dev, "%s: invalid command %*ph\n", 209 __func__, (int)cmd_size, cmd); 210 return -EINVAL; 211 } 212 213 msgs[0].addr = client->addr; 214 msgs[0].flags = client->flags & I2C_M_TEN; 215 msgs[0].len = cmd_size; 216 msgs[0].buf = (u8 *)cmd; 217 218 msgs[1].addr = client->addr; 219 msgs[1].flags = client->flags & I2C_M_TEN; 220 msgs[1].flags |= I2C_M_RD; 221 msgs[1].len = resp_size; 222 msgs[1].buf = resp; 223 224 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 225 if (ret < 0) 226 return ret; 227 228 if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response) 229 return -EIO; 230 231 return 0; 232 } 233 234 static int elants_i2c_calibrate(struct elants_data *ts) 235 { 236 struct i2c_client *client = ts->client; 237 int ret, error; 238 static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A }; 239 static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 }; 240 static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; 241 242 disable_irq(client->irq); 243 244 ts->state = ELAN_WAIT_RECALIBRATION; 245 reinit_completion(&ts->cmd_done); 246 247 elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); 248 elants_i2c_send(client, rek, sizeof(rek)); 249 250 enable_irq(client->irq); 251 252 ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, 253 msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); 254 255 ts->state = ELAN_STATE_NORMAL; 256 257 if (ret <= 0) { 258 error = ret < 0 ? ret : -ETIMEDOUT; 259 dev_err(&client->dev, 260 "error while waiting for calibration to complete: %d\n", 261 error); 262 return error; 263 } 264 265 if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { 266 dev_err(&client->dev, 267 "unexpected calibration response: %*ph\n", 268 (int)sizeof(ts->cmd_resp), ts->cmd_resp); 269 return -EINVAL; 270 } 271 272 return 0; 273 } 274 275 static int elants_i2c_sw_reset(struct i2c_client *client) 276 { 277 const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; 278 int error; 279 280 error = elants_i2c_send(client, soft_rst_cmd, 281 sizeof(soft_rst_cmd)); 282 if (error) { 283 dev_err(&client->dev, "software reset failed: %d\n", error); 284 return error; 285 } 286 287 /* 288 * We should wait at least 10 msec (but no more than 40) before 289 * sending fastboot or IAP command to the device. 290 */ 291 msleep(30); 292 293 return 0; 294 } 295 296 static u16 elants_i2c_parse_version(u8 *buf) 297 { 298 return get_unaligned_be32(buf) >> 4; 299 } 300 301 static int elants_i2c_query_hw_version(struct elants_data *ts) 302 { 303 struct i2c_client *client = ts->client; 304 int error, retry_cnt; 305 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; 306 u8 resp[HEADER_SIZE]; 307 308 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 309 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 310 resp, sizeof(resp)); 311 if (!error) { 312 ts->hw_version = elants_i2c_parse_version(resp); 313 if (ts->hw_version != 0xffff) 314 return 0; 315 } 316 317 dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n", 318 error, (int)sizeof(resp), resp); 319 } 320 321 if (error) { 322 dev_err(&client->dev, 323 "Failed to read fw id: %d\n", error); 324 return error; 325 } 326 327 dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); 328 329 return -EINVAL; 330 } 331 332 static int elants_i2c_query_fw_version(struct elants_data *ts) 333 { 334 struct i2c_client *client = ts->client; 335 int error, retry_cnt; 336 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; 337 u8 resp[HEADER_SIZE]; 338 339 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 340 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 341 resp, sizeof(resp)); 342 if (!error) { 343 ts->fw_version = elants_i2c_parse_version(resp); 344 if (ts->fw_version != 0x0000 && 345 ts->fw_version != 0xffff) 346 return 0; 347 } 348 349 dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n", 350 error, (int)sizeof(resp), resp); 351 } 352 353 dev_err(&client->dev, 354 "Failed to read fw version or fw version is invalid\n"); 355 356 return -EINVAL; 357 } 358 359 static int elants_i2c_query_test_version(struct elants_data *ts) 360 { 361 struct i2c_client *client = ts->client; 362 int error, retry_cnt; 363 u16 version; 364 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; 365 u8 resp[HEADER_SIZE]; 366 367 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 368 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 369 resp, sizeof(resp)); 370 if (!error) { 371 version = elants_i2c_parse_version(resp); 372 ts->test_version = version >> 8; 373 ts->solution_version = version & 0xff; 374 375 return 0; 376 } 377 378 dev_dbg(&client->dev, 379 "read test version error rc=%d, buf=%*phC\n", 380 error, (int)sizeof(resp), resp); 381 } 382 383 dev_err(&client->dev, "Failed to read test version\n"); 384 385 return -EINVAL; 386 } 387 388 static int elants_i2c_query_bc_version(struct elants_data *ts) 389 { 390 struct i2c_client *client = ts->client; 391 const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; 392 u8 resp[HEADER_SIZE]; 393 u16 version; 394 int error; 395 396 error = elants_i2c_execute_command(client, cmd, sizeof(cmd), 397 resp, sizeof(resp)); 398 if (error) { 399 dev_err(&client->dev, 400 "read BC version error=%d, buf=%*phC\n", 401 error, (int)sizeof(resp), resp); 402 return error; 403 } 404 405 version = elants_i2c_parse_version(resp); 406 ts->bc_version = version >> 8; 407 ts->iap_version = version & 0xff; 408 409 return 0; 410 } 411 412 static int elants_i2c_query_ts_info(struct elants_data *ts) 413 { 414 struct i2c_client *client = ts->client; 415 int error; 416 u8 resp[17]; 417 u16 phy_x, phy_y, rows, cols, osr; 418 const u8 get_resolution_cmd[] = { 419 CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 420 }; 421 const u8 get_osr_cmd[] = { 422 CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 423 }; 424 const u8 get_physical_scan_cmd[] = { 425 CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 426 }; 427 const u8 get_physical_drive_cmd[] = { 428 CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 429 }; 430 431 /* Get trace number */ 432 error = elants_i2c_execute_command(client, 433 get_resolution_cmd, 434 sizeof(get_resolution_cmd), 435 resp, sizeof(resp)); 436 if (error) { 437 dev_err(&client->dev, "get resolution command failed: %d\n", 438 error); 439 return error; 440 } 441 442 rows = resp[2] + resp[6] + resp[10]; 443 cols = resp[3] + resp[7] + resp[11]; 444 445 /* Process mm_to_pixel information */ 446 error = elants_i2c_execute_command(client, 447 get_osr_cmd, sizeof(get_osr_cmd), 448 resp, sizeof(resp)); 449 if (error) { 450 dev_err(&client->dev, "get osr command failed: %d\n", 451 error); 452 return error; 453 } 454 455 osr = resp[3]; 456 457 error = elants_i2c_execute_command(client, 458 get_physical_scan_cmd, 459 sizeof(get_physical_scan_cmd), 460 resp, sizeof(resp)); 461 if (error) { 462 dev_err(&client->dev, "get physical scan command failed: %d\n", 463 error); 464 return error; 465 } 466 467 phy_x = get_unaligned_be16(&resp[2]); 468 469 error = elants_i2c_execute_command(client, 470 get_physical_drive_cmd, 471 sizeof(get_physical_drive_cmd), 472 resp, sizeof(resp)); 473 if (error) { 474 dev_err(&client->dev, "get physical drive command failed: %d\n", 475 error); 476 return error; 477 } 478 479 phy_y = get_unaligned_be16(&resp[2]); 480 481 dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); 482 483 if (rows == 0 || cols == 0 || osr == 0) { 484 dev_warn(&client->dev, 485 "invalid trace number data: %d, %d, %d\n", 486 rows, cols, osr); 487 } else { 488 /* translate trace number to TS resolution */ 489 ts->x_max = ELAN_TS_RESOLUTION(rows, osr); 490 ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); 491 ts->y_max = ELAN_TS_RESOLUTION(cols, osr); 492 ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); 493 } 494 495 return 0; 496 } 497 498 static int elants_i2c_fastboot(struct i2c_client *client) 499 { 500 const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; 501 int error; 502 503 error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); 504 if (error) { 505 dev_err(&client->dev, "boot failed: %d\n", error); 506 return error; 507 } 508 509 dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); 510 return 0; 511 } 512 513 static int elants_i2c_initialize(struct elants_data *ts) 514 { 515 struct i2c_client *client = ts->client; 516 int error, error2, retry_cnt; 517 const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; 518 const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; 519 u8 buf[HEADER_SIZE]; 520 521 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 522 error = elants_i2c_sw_reset(client); 523 if (error) { 524 /* Continue initializing if it's the last try */ 525 if (retry_cnt < MAX_RETRIES - 1) 526 continue; 527 } 528 529 error = elants_i2c_fastboot(client); 530 if (error) { 531 /* Continue initializing if it's the last try */ 532 if (retry_cnt < MAX_RETRIES - 1) 533 continue; 534 } 535 536 /* Wait for Hello packet */ 537 msleep(BOOT_TIME_DELAY_MS); 538 539 error = elants_i2c_read(client, buf, sizeof(buf)); 540 if (error) { 541 dev_err(&client->dev, 542 "failed to read 'hello' packet: %d\n", error); 543 } else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { 544 ts->iap_mode = ELAN_IAP_OPERATIONAL; 545 break; 546 } else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { 547 /* 548 * Setting error code will mark device 549 * in recovery mode below. 550 */ 551 error = -EIO; 552 break; 553 } else { 554 error = -EINVAL; 555 dev_err(&client->dev, 556 "invalid 'hello' packet: %*ph\n", 557 (int)sizeof(buf), buf); 558 } 559 } 560 561 /* hw version is available even if device in recovery state */ 562 error2 = elants_i2c_query_hw_version(ts); 563 if (!error) 564 error = error2; 565 566 if (!error) 567 error = elants_i2c_query_fw_version(ts); 568 if (!error) 569 error = elants_i2c_query_test_version(ts); 570 if (!error) 571 error = elants_i2c_query_bc_version(ts); 572 if (!error) 573 error = elants_i2c_query_ts_info(ts); 574 575 if (error) 576 ts->iap_mode = ELAN_IAP_RECOVERY; 577 578 return 0; 579 } 580 581 /* 582 * Firmware update interface. 583 */ 584 585 static int elants_i2c_fw_write_page(struct i2c_client *client, 586 const void *page) 587 { 588 const u8 ack_ok[] = { 0xaa, 0xaa }; 589 u8 buf[2]; 590 int retry; 591 int error; 592 593 for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { 594 error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); 595 if (error) { 596 dev_err(&client->dev, 597 "IAP Write Page failed: %d\n", error); 598 continue; 599 } 600 601 error = elants_i2c_read(client, buf, 2); 602 if (error) { 603 dev_err(&client->dev, 604 "IAP Ack read failed: %d\n", error); 605 return error; 606 } 607 608 if (!memcmp(buf, ack_ok, sizeof(ack_ok))) 609 return 0; 610 611 error = -EIO; 612 dev_err(&client->dev, 613 "IAP Get Ack Error [%02x:%02x]\n", 614 buf[0], buf[1]); 615 } 616 617 return error; 618 } 619 620 static int elants_i2c_do_update_firmware(struct i2c_client *client, 621 const struct firmware *fw, 622 bool force) 623 { 624 const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; 625 const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; 626 const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; 627 const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01}; 628 u8 buf[HEADER_SIZE]; 629 u16 send_id; 630 int page, n_fw_pages; 631 int error; 632 633 /* Recovery mode detection! */ 634 if (force) { 635 dev_dbg(&client->dev, "Recovery mode procedure\n"); 636 error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); 637 } else { 638 /* Start IAP Procedure */ 639 dev_dbg(&client->dev, "Normal IAP procedure\n"); 640 /* Close idle mode */ 641 error = elants_i2c_send(client, close_idle, sizeof(close_idle)); 642 if (error) 643 dev_err(&client->dev, "Failed close idle: %d\n", error); 644 msleep(60); 645 elants_i2c_sw_reset(client); 646 msleep(20); 647 error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); 648 } 649 650 if (error) { 651 dev_err(&client->dev, "failed to enter IAP mode: %d\n", error); 652 return error; 653 } 654 655 msleep(20); 656 657 /* check IAP state */ 658 error = elants_i2c_read(client, buf, 4); 659 if (error) { 660 dev_err(&client->dev, 661 "failed to read IAP acknowledgement: %d\n", 662 error); 663 return error; 664 } 665 666 if (memcmp(buf, iap_ack, sizeof(iap_ack))) { 667 dev_err(&client->dev, 668 "failed to enter IAP: %*ph (expected %*ph)\n", 669 (int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); 670 return -EIO; 671 } 672 673 dev_info(&client->dev, "successfully entered IAP mode"); 674 675 send_id = client->addr; 676 error = elants_i2c_send(client, &send_id, 1); 677 if (error) { 678 dev_err(&client->dev, "sending dummy byte failed: %d\n", 679 error); 680 return error; 681 } 682 683 /* Clear the last page of Master */ 684 error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); 685 if (error) { 686 dev_err(&client->dev, "clearing of the last page failed: %d\n", 687 error); 688 return error; 689 } 690 691 error = elants_i2c_read(client, buf, 2); 692 if (error) { 693 dev_err(&client->dev, 694 "failed to read ACK for clearing the last page: %d\n", 695 error); 696 return error; 697 } 698 699 n_fw_pages = fw->size / ELAN_FW_PAGESIZE; 700 dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); 701 702 for (page = 0; page < n_fw_pages; page++) { 703 error = elants_i2c_fw_write_page(client, 704 fw->data + page * ELAN_FW_PAGESIZE); 705 if (error) { 706 dev_err(&client->dev, 707 "failed to write FW page %d: %d\n", 708 page, error); 709 return error; 710 } 711 } 712 713 /* Old iap needs to wait 200ms for WDT and rest is for hello packets */ 714 msleep(300); 715 716 dev_info(&client->dev, "firmware update completed\n"); 717 return 0; 718 } 719 720 static int elants_i2c_fw_update(struct elants_data *ts) 721 { 722 struct i2c_client *client = ts->client; 723 const struct firmware *fw; 724 char *fw_name; 725 int error; 726 727 fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); 728 if (!fw_name) 729 return -ENOMEM; 730 731 dev_info(&client->dev, "requesting fw name = %s\n", fw_name); 732 error = request_firmware(&fw, fw_name, &client->dev); 733 kfree(fw_name); 734 if (error) { 735 dev_err(&client->dev, "failed to request firmware: %d\n", 736 error); 737 return error; 738 } 739 740 if (fw->size % ELAN_FW_PAGESIZE) { 741 dev_err(&client->dev, "invalid firmware length: %zu\n", 742 fw->size); 743 error = -EINVAL; 744 goto out; 745 } 746 747 disable_irq(client->irq); 748 749 error = elants_i2c_do_update_firmware(client, fw, 750 ts->iap_mode == ELAN_IAP_RECOVERY); 751 if (error) { 752 dev_err(&client->dev, "firmware update failed: %d\n", error); 753 ts->iap_mode = ELAN_IAP_RECOVERY; 754 goto out_enable_irq; 755 } 756 757 error = elants_i2c_initialize(ts); 758 if (error) { 759 dev_err(&client->dev, 760 "failed to initialize device after firmware update: %d\n", 761 error); 762 ts->iap_mode = ELAN_IAP_RECOVERY; 763 goto out_enable_irq; 764 } 765 766 ts->iap_mode = ELAN_IAP_OPERATIONAL; 767 768 out_enable_irq: 769 ts->state = ELAN_STATE_NORMAL; 770 enable_irq(client->irq); 771 msleep(100); 772 773 if (!error) 774 elants_i2c_calibrate(ts); 775 out: 776 release_firmware(fw); 777 return error; 778 } 779 780 /* 781 * Event reporting. 782 */ 783 784 static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf) 785 { 786 struct input_dev *input = ts->input; 787 unsigned int n_fingers; 788 u16 finger_state; 789 int i; 790 791 n_fingers = buf[FW_POS_STATE + 1] & 0x0f; 792 finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | 793 buf[FW_POS_STATE]; 794 795 dev_dbg(&ts->client->dev, 796 "n_fingers: %u, state: %04x\n", n_fingers, finger_state); 797 798 for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { 799 if (finger_state & 1) { 800 unsigned int x, y, p, w; 801 u8 *pos; 802 803 pos = &buf[FW_POS_XY + i * 3]; 804 x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; 805 y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; 806 p = buf[FW_POS_PRESSURE + i]; 807 w = buf[FW_POS_WIDTH + i]; 808 809 dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", 810 i, x, y, p, w); 811 812 input_mt_slot(input, i); 813 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 814 input_event(input, EV_ABS, ABS_MT_POSITION_X, x); 815 input_event(input, EV_ABS, ABS_MT_POSITION_Y, y); 816 input_event(input, EV_ABS, ABS_MT_PRESSURE, p); 817 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); 818 819 n_fingers--; 820 } 821 822 finger_state >>= 1; 823 } 824 825 input_mt_sync_frame(input); 826 input_sync(input); 827 } 828 829 static u8 elants_i2c_calculate_checksum(u8 *buf) 830 { 831 u8 checksum = 0; 832 u8 i; 833 834 for (i = 0; i < FW_POS_CHECKSUM; i++) 835 checksum += buf[i]; 836 837 return checksum; 838 } 839 840 static void elants_i2c_event(struct elants_data *ts, u8 *buf) 841 { 842 u8 checksum = elants_i2c_calculate_checksum(buf); 843 844 if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) 845 dev_warn(&ts->client->dev, 846 "%s: invalid checksum for packet %02x: %02x vs. %02x\n", 847 __func__, buf[FW_POS_HEADER], 848 checksum, buf[FW_POS_CHECKSUM]); 849 else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) 850 dev_warn(&ts->client->dev, 851 "%s: unknown packet type: %02x\n", 852 __func__, buf[FW_POS_HEADER]); 853 else 854 elants_i2c_mt_event(ts, buf); 855 } 856 857 static irqreturn_t elants_i2c_irq(int irq, void *_dev) 858 { 859 const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; 860 struct elants_data *ts = _dev; 861 struct i2c_client *client = ts->client; 862 int report_count, report_len; 863 int i; 864 int len; 865 866 len = i2c_master_recv(client, ts->buf, sizeof(ts->buf)); 867 if (len < 0) { 868 dev_err(&client->dev, "%s: failed to read data: %d\n", 869 __func__, len); 870 goto out; 871 } 872 873 dev_dbg(&client->dev, "%s: packet %*ph\n", 874 __func__, HEADER_SIZE, ts->buf); 875 876 switch (ts->state) { 877 case ELAN_WAIT_RECALIBRATION: 878 if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { 879 memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); 880 complete(&ts->cmd_done); 881 ts->state = ELAN_STATE_NORMAL; 882 } 883 break; 884 885 case ELAN_WAIT_QUEUE_HEADER: 886 if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) 887 break; 888 889 ts->state = ELAN_STATE_NORMAL; 890 /* fall through */ 891 892 case ELAN_STATE_NORMAL: 893 894 switch (ts->buf[FW_HDR_TYPE]) { 895 case CMD_HEADER_HELLO: 896 case CMD_HEADER_RESP: 897 case CMD_HEADER_REK: 898 break; 899 900 case QUEUE_HEADER_WAIT: 901 if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { 902 dev_err(&client->dev, 903 "invalid wait packet %*ph\n", 904 HEADER_SIZE, ts->buf); 905 } else { 906 ts->state = ELAN_WAIT_QUEUE_HEADER; 907 udelay(30); 908 } 909 break; 910 911 case QUEUE_HEADER_SINGLE: 912 elants_i2c_event(ts, &ts->buf[HEADER_SIZE]); 913 break; 914 915 case QUEUE_HEADER_NORMAL: 916 report_count = ts->buf[FW_HDR_COUNT]; 917 if (report_count == 0 || report_count > 3) { 918 dev_err(&client->dev, 919 "bad report count: %*ph\n", 920 HEADER_SIZE, ts->buf); 921 break; 922 } 923 924 report_len = ts->buf[FW_HDR_LENGTH] / report_count; 925 if (report_len != PACKET_SIZE) { 926 dev_err(&client->dev, 927 "mismatching report length: %*ph\n", 928 HEADER_SIZE, ts->buf); 929 break; 930 } 931 932 for (i = 0; i < report_count; i++) { 933 u8 *buf = ts->buf + HEADER_SIZE + 934 i * PACKET_SIZE; 935 elants_i2c_event(ts, buf); 936 } 937 break; 938 939 default: 940 dev_err(&client->dev, "unknown packet %*ph\n", 941 HEADER_SIZE, ts->buf); 942 break; 943 } 944 break; 945 } 946 947 out: 948 return IRQ_HANDLED; 949 } 950 951 /* 952 * sysfs interface 953 */ 954 static ssize_t calibrate_store(struct device *dev, 955 struct device_attribute *attr, 956 const char *buf, size_t count) 957 { 958 struct i2c_client *client = to_i2c_client(dev); 959 struct elants_data *ts = i2c_get_clientdata(client); 960 int error; 961 962 error = mutex_lock_interruptible(&ts->sysfs_mutex); 963 if (error) 964 return error; 965 966 error = elants_i2c_calibrate(ts); 967 968 mutex_unlock(&ts->sysfs_mutex); 969 return error ?: count; 970 } 971 972 static ssize_t write_update_fw(struct device *dev, 973 struct device_attribute *attr, 974 const char *buf, size_t count) 975 { 976 struct i2c_client *client = to_i2c_client(dev); 977 struct elants_data *ts = i2c_get_clientdata(client); 978 int error; 979 980 error = mutex_lock_interruptible(&ts->sysfs_mutex); 981 if (error) 982 return error; 983 984 error = elants_i2c_fw_update(ts); 985 dev_dbg(dev, "firmware update result: %d\n", error); 986 987 mutex_unlock(&ts->sysfs_mutex); 988 return error ?: count; 989 } 990 991 static ssize_t show_iap_mode(struct device *dev, 992 struct device_attribute *attr, char *buf) 993 { 994 struct i2c_client *client = to_i2c_client(dev); 995 struct elants_data *ts = i2c_get_clientdata(client); 996 997 return sprintf(buf, "%s\n", 998 ts->iap_mode == ELAN_IAP_OPERATIONAL ? 999 "Normal" : "Recovery"); 1000 } 1001 1002 static DEVICE_ATTR_WO(calibrate); 1003 static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); 1004 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); 1005 1006 struct elants_version_attribute { 1007 struct device_attribute dattr; 1008 size_t field_offset; 1009 size_t field_size; 1010 }; 1011 1012 #define __ELANTS_FIELD_SIZE(_field) \ 1013 sizeof(((struct elants_data *)NULL)->_field) 1014 #define __ELANTS_VERIFY_SIZE(_field) \ 1015 (BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ 1016 __ELANTS_FIELD_SIZE(_field)) 1017 #define ELANTS_VERSION_ATTR(_field) \ 1018 struct elants_version_attribute elants_ver_attr_##_field = { \ 1019 .dattr = __ATTR(_field, S_IRUGO, \ 1020 elants_version_attribute_show, NULL), \ 1021 .field_offset = offsetof(struct elants_data, _field), \ 1022 .field_size = __ELANTS_VERIFY_SIZE(_field), \ 1023 } 1024 1025 static ssize_t elants_version_attribute_show(struct device *dev, 1026 struct device_attribute *dattr, 1027 char *buf) 1028 { 1029 struct i2c_client *client = to_i2c_client(dev); 1030 struct elants_data *ts = i2c_get_clientdata(client); 1031 struct elants_version_attribute *attr = 1032 container_of(dattr, struct elants_version_attribute, dattr); 1033 u8 *field = (u8 *)((char *)ts + attr->field_offset); 1034 unsigned int fmt_size; 1035 unsigned int val; 1036 1037 if (attr->field_size == 1) { 1038 val = *field; 1039 fmt_size = 2; /* 2 HEX digits */ 1040 } else { 1041 val = *(u16 *)field; 1042 fmt_size = 4; /* 4 HEX digits */ 1043 } 1044 1045 return sprintf(buf, "%0*x\n", fmt_size, val); 1046 } 1047 1048 static ELANTS_VERSION_ATTR(fw_version); 1049 static ELANTS_VERSION_ATTR(hw_version); 1050 static ELANTS_VERSION_ATTR(test_version); 1051 static ELANTS_VERSION_ATTR(solution_version); 1052 static ELANTS_VERSION_ATTR(bc_version); 1053 static ELANTS_VERSION_ATTR(iap_version); 1054 1055 static struct attribute *elants_attributes[] = { 1056 &dev_attr_calibrate.attr, 1057 &dev_attr_update_fw.attr, 1058 &dev_attr_iap_mode.attr, 1059 1060 &elants_ver_attr_fw_version.dattr.attr, 1061 &elants_ver_attr_hw_version.dattr.attr, 1062 &elants_ver_attr_test_version.dattr.attr, 1063 &elants_ver_attr_solution_version.dattr.attr, 1064 &elants_ver_attr_bc_version.dattr.attr, 1065 &elants_ver_attr_iap_version.dattr.attr, 1066 NULL 1067 }; 1068 1069 static const struct attribute_group elants_attribute_group = { 1070 .attrs = elants_attributes, 1071 }; 1072 1073 static int elants_i2c_power_on(struct elants_data *ts) 1074 { 1075 int error; 1076 1077 /* 1078 * If we do not have reset gpio assume platform firmware 1079 * controls regulators and does power them on for us. 1080 */ 1081 if (IS_ERR_OR_NULL(ts->reset_gpio)) 1082 return 0; 1083 1084 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1085 1086 error = regulator_enable(ts->vcc33); 1087 if (error) { 1088 dev_err(&ts->client->dev, 1089 "failed to enable vcc33 regulator: %d\n", 1090 error); 1091 goto release_reset_gpio; 1092 } 1093 1094 error = regulator_enable(ts->vccio); 1095 if (error) { 1096 dev_err(&ts->client->dev, 1097 "failed to enable vccio regulator: %d\n", 1098 error); 1099 regulator_disable(ts->vcc33); 1100 goto release_reset_gpio; 1101 } 1102 1103 /* 1104 * We need to wait a bit after powering on controller before 1105 * we are allowed to release reset GPIO. 1106 */ 1107 udelay(ELAN_POWERON_DELAY_USEC); 1108 1109 release_reset_gpio: 1110 gpiod_set_value_cansleep(ts->reset_gpio, 0); 1111 if (error) 1112 return error; 1113 1114 msleep(ELAN_RESET_DELAY_MSEC); 1115 1116 return 0; 1117 } 1118 1119 static void elants_i2c_power_off(void *_data) 1120 { 1121 struct elants_data *ts = _data; 1122 1123 if (!IS_ERR_OR_NULL(ts->reset_gpio)) { 1124 /* 1125 * Activate reset gpio to prevent leakage through the 1126 * pin once we shut off power to the controller. 1127 */ 1128 gpiod_set_value_cansleep(ts->reset_gpio, 1); 1129 regulator_disable(ts->vccio); 1130 regulator_disable(ts->vcc33); 1131 } 1132 } 1133 1134 static int elants_i2c_probe(struct i2c_client *client, 1135 const struct i2c_device_id *id) 1136 { 1137 union i2c_smbus_data dummy; 1138 struct elants_data *ts; 1139 unsigned long irqflags; 1140 int error; 1141 1142 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1143 dev_err(&client->dev, 1144 "%s: i2c check functionality error\n", DEVICE_NAME); 1145 return -ENXIO; 1146 } 1147 1148 ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); 1149 if (!ts) 1150 return -ENOMEM; 1151 1152 mutex_init(&ts->sysfs_mutex); 1153 init_completion(&ts->cmd_done); 1154 1155 ts->client = client; 1156 i2c_set_clientdata(client, ts); 1157 1158 ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); 1159 if (IS_ERR(ts->vcc33)) { 1160 error = PTR_ERR(ts->vcc33); 1161 if (error != -EPROBE_DEFER) 1162 dev_err(&client->dev, 1163 "Failed to get 'vcc33' regulator: %d\n", 1164 error); 1165 return error; 1166 } 1167 1168 ts->vccio = devm_regulator_get(&client->dev, "vccio"); 1169 if (IS_ERR(ts->vccio)) { 1170 error = PTR_ERR(ts->vccio); 1171 if (error != -EPROBE_DEFER) 1172 dev_err(&client->dev, 1173 "Failed to get 'vccio' regulator: %d\n", 1174 error); 1175 return error; 1176 } 1177 1178 ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 1179 if (IS_ERR(ts->reset_gpio)) { 1180 error = PTR_ERR(ts->reset_gpio); 1181 1182 if (error == -EPROBE_DEFER) 1183 return error; 1184 1185 if (error != -ENOENT && error != -ENOSYS) { 1186 dev_err(&client->dev, 1187 "failed to get reset gpio: %d\n", 1188 error); 1189 return error; 1190 } 1191 1192 ts->keep_power_in_suspend = true; 1193 } 1194 1195 error = elants_i2c_power_on(ts); 1196 if (error) 1197 return error; 1198 1199 error = devm_add_action(&client->dev, elants_i2c_power_off, ts); 1200 if (error) { 1201 dev_err(&client->dev, 1202 "failed to install power off action: %d\n", error); 1203 elants_i2c_power_off(ts); 1204 return error; 1205 } 1206 1207 /* Make sure there is something at this address */ 1208 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1209 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 1210 dev_err(&client->dev, "nothing at this address\n"); 1211 return -ENXIO; 1212 } 1213 1214 error = elants_i2c_initialize(ts); 1215 if (error) { 1216 dev_err(&client->dev, "failed to initialize: %d\n", error); 1217 return error; 1218 } 1219 1220 ts->input = devm_input_allocate_device(&client->dev); 1221 if (!ts->input) { 1222 dev_err(&client->dev, "Failed to allocate input device\n"); 1223 return -ENOMEM; 1224 } 1225 1226 ts->input->name = "Elan Touchscreen"; 1227 ts->input->id.bustype = BUS_I2C; 1228 1229 __set_bit(BTN_TOUCH, ts->input->keybit); 1230 __set_bit(EV_ABS, ts->input->evbit); 1231 __set_bit(EV_KEY, ts->input->evbit); 1232 1233 /* Single touch input params setup */ 1234 input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0); 1235 input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0); 1236 input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0); 1237 input_abs_set_res(ts->input, ABS_X, ts->x_res); 1238 input_abs_set_res(ts->input, ABS_Y, ts->y_res); 1239 1240 /* Multitouch input params setup */ 1241 error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, 1242 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1243 if (error) { 1244 dev_err(&client->dev, 1245 "failed to initialize MT slots: %d\n", error); 1246 return error; 1247 } 1248 1249 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); 1250 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); 1251 input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 1252 input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); 1253 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); 1254 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); 1255 1256 error = input_register_device(ts->input); 1257 if (error) { 1258 dev_err(&client->dev, 1259 "unable to register input device: %d\n", error); 1260 return error; 1261 } 1262 1263 /* 1264 * Platform code (ACPI, DTS) should normally set up interrupt 1265 * for us, but in case it did not let's fall back to using falling 1266 * edge to be compatible with older Chromebooks. 1267 */ 1268 irqflags = irq_get_trigger_type(client->irq); 1269 if (!irqflags) 1270 irqflags = IRQF_TRIGGER_FALLING; 1271 1272 error = devm_request_threaded_irq(&client->dev, client->irq, 1273 NULL, elants_i2c_irq, 1274 irqflags | IRQF_ONESHOT, 1275 client->name, ts); 1276 if (error) { 1277 dev_err(&client->dev, "Failed to register interrupt\n"); 1278 return error; 1279 } 1280 1281 /* 1282 * Systems using device tree should set up wakeup via DTS, 1283 * the rest will configure device as wakeup source by default. 1284 */ 1285 if (!client->dev.of_node) 1286 device_init_wakeup(&client->dev, true); 1287 1288 error = devm_device_add_group(&client->dev, &elants_attribute_group); 1289 if (error) { 1290 dev_err(&client->dev, "failed to create sysfs attributes: %d\n", 1291 error); 1292 return error; 1293 } 1294 1295 return 0; 1296 } 1297 1298 static int __maybe_unused elants_i2c_suspend(struct device *dev) 1299 { 1300 struct i2c_client *client = to_i2c_client(dev); 1301 struct elants_data *ts = i2c_get_clientdata(client); 1302 const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 }; 1303 int retry_cnt; 1304 int error; 1305 1306 /* Command not support in IAP recovery mode */ 1307 if (ts->iap_mode != ELAN_IAP_OPERATIONAL) 1308 return -EBUSY; 1309 1310 disable_irq(client->irq); 1311 1312 if (device_may_wakeup(dev)) { 1313 /* 1314 * The device will automatically enter idle mode 1315 * that has reduced power consumption. 1316 */ 1317 ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); 1318 } else if (ts->keep_power_in_suspend) { 1319 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1320 error = elants_i2c_send(client, set_sleep_cmd, 1321 sizeof(set_sleep_cmd)); 1322 if (!error) 1323 break; 1324 1325 dev_err(&client->dev, 1326 "suspend command failed: %d\n", error); 1327 } 1328 } else { 1329 elants_i2c_power_off(ts); 1330 } 1331 1332 return 0; 1333 } 1334 1335 static int __maybe_unused elants_i2c_resume(struct device *dev) 1336 { 1337 struct i2c_client *client = to_i2c_client(dev); 1338 struct elants_data *ts = i2c_get_clientdata(client); 1339 const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 }; 1340 int retry_cnt; 1341 int error; 1342 1343 if (device_may_wakeup(dev)) { 1344 if (ts->wake_irq_enabled) 1345 disable_irq_wake(client->irq); 1346 elants_i2c_sw_reset(client); 1347 } else if (ts->keep_power_in_suspend) { 1348 for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { 1349 error = elants_i2c_send(client, set_active_cmd, 1350 sizeof(set_active_cmd)); 1351 if (!error) 1352 break; 1353 1354 dev_err(&client->dev, 1355 "resume command failed: %d\n", error); 1356 } 1357 } else { 1358 elants_i2c_power_on(ts); 1359 elants_i2c_initialize(ts); 1360 } 1361 1362 ts->state = ELAN_STATE_NORMAL; 1363 enable_irq(client->irq); 1364 1365 return 0; 1366 } 1367 1368 static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, 1369 elants_i2c_suspend, elants_i2c_resume); 1370 1371 static const struct i2c_device_id elants_i2c_id[] = { 1372 { DEVICE_NAME, 0 }, 1373 { } 1374 }; 1375 MODULE_DEVICE_TABLE(i2c, elants_i2c_id); 1376 1377 #ifdef CONFIG_ACPI 1378 static const struct acpi_device_id elants_acpi_id[] = { 1379 { "ELAN0001", 0 }, 1380 { } 1381 }; 1382 MODULE_DEVICE_TABLE(acpi, elants_acpi_id); 1383 #endif 1384 1385 #ifdef CONFIG_OF 1386 static const struct of_device_id elants_of_match[] = { 1387 { .compatible = "elan,ekth3500" }, 1388 { /* sentinel */ } 1389 }; 1390 MODULE_DEVICE_TABLE(of, elants_of_match); 1391 #endif 1392 1393 static struct i2c_driver elants_i2c_driver = { 1394 .probe = elants_i2c_probe, 1395 .id_table = elants_i2c_id, 1396 .driver = { 1397 .name = DEVICE_NAME, 1398 .pm = &elants_i2c_pm_ops, 1399 .acpi_match_table = ACPI_PTR(elants_acpi_id), 1400 .of_match_table = of_match_ptr(elants_of_match), 1401 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1402 }, 1403 }; 1404 module_i2c_driver(elants_i2c_driver); 1405 1406 MODULE_AUTHOR("Scott Liu <scott.liu@emc.com.tw>"); 1407 MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); 1408 MODULE_LICENSE("GPL"); 1409